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Ultrasonic measurement method is a new one. It has many advantages, such as, not changing the profile of the flow and characters of the fluid, non-invasion, no pressure losing and can work under the severe conditions. Collecting the flow noise signals at the upstream and downstream of the pipe, adopting the cross correlation method to analysis signals, calculating the cross correlation function and finding the peak of it, then we can get the transit time.

超声波流量测量具有不改变流动状态与性质、非接触、耐恶劣环境等优点，通过对所采集的上、下游流动噪声信号进行相关分析，其互相关函数的峰值位置所对应的时间，为流体流过上、下游传感器之间的距离所用时间，进而计算出流速和流量。

PSD method for identifying cross power spectral density of distributed excitation force is discussed by calculating cross power spectral density of measured response.

功率谱密度函数识别法则是以系统反应之交叉功率谱密度函数识别外力之交叉功率谱密度函数。

In crosswind direction, the influence of vortex shedding for pole-type structures with different geometrical parameters is analyzed, the method for calculating crosswind response is presented.

同时考虑了不同风速下横风向旋涡脱落对于不同参数的杆式构件的影响，并给出横风向风振响应的计算方法。

For a new crystal LiNbO3 detector, a new theoretic calculating method is presented for the first time.

对一种新的用于超快电磁脉冲检测的晶体探测器，首次给出一个普遍情况下的理论计算方法。

A theoretical model for calculating the cutting angle with different crystal planes, orientations and tool orthogonal rakes are described in this paper. It is built with the ultra-precision cutting model by the principle of the maximum specific energy of shear deformation and the mechanism of change of the shear modulus with...

本文利用剪切变形比能最大及单晶材料不同晶面晶向剪切弹性模量不同的原理，结合超精密切削模型，从理论上计算出不同晶面、不同晶向及不同刀具前角超精密切削条件下的剪切角，得到其在不同切削条件下的变化规律，并由此解释了切削加工中由KDP晶体各向异性所导致的工件表面粗糙度的各向异性。

The Transfer Matrix Method is applied to calculating the transmission properties of two-terminal crystal system and crystal system with ring structure.

应用转移矩阵法计算了两终端晶格系统和带有环状结构的晶格系统的电子输运性质。

In this thesis, the Transfer Matrix Method is applied to calculating two-terminal crystal system and crystal system with ring structure.

本文主要应用转移矩阵法研究一维晶格的量子输运问题。

The method of calculating the crystallinity of polyethylene was studied by DSC.

论文研究和制定了用DSC测定聚乙烯结晶度的方法。

Through this translation, European mathematicians got to know methods for calculating the areas of triangles, volumes of spheres as well as square and cube root .

通过这种翻译，欧洲数学家开始接触三角形的计算模型，同样也有关于球体，矩形和立方根的卷册。

This new cubic type of status equation currently represents a relatively good mathematical model for calculating the phase equilibrium parameters of water and the properties of saturated humid air.

这个新的立方型状态方程是目前计算水的相平衡参数和饱和湿空气性质较好的数学模型。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。